Valve tappet



Dec. 1926.

. H. FRASER VALVE TA PPET Filed June G, 1925 nvenfoz Patented Dec. 7,1926.

UNITED, STATES lPAT-lam A oFF-ICE.

HARRY FRASER, oF roNTIAq-MICHIGAN; AssIGNoR To GENERAL morons conforta-TIQN, OF.DETROIT, MICHIGAN, A CORPORATION F DELAWARE.

- vALvE TAPPET Ap'plication med :une s, 1925.- serial no. 35,42?.

It is an object of this invent-ion to provide parts which are subjectedto hard rubbing action and impact, or impact alone, with a protectivecovering which ,will prevent ex- 1 cessive= Wear. This covering orcoating is ycomposed of a relativelyfsoft metal which.,V

portion of l the tappet. which engages lthe shaft `and'is subjected to acombined rubbing and pounding action. However, it is obvious that myinvention is not limited to this specific application. Referring nowtothe drawings:

Figure l shows a side elevation of a couple of valve tappets operativelyassembled with.

` metallic substance containing tin.

the 'cam shaft; and Figure 2 1s a plan viewl of the cam vengagingportion of t e tappet.

The drawing shows a mushroom valve.

tappet 2 of conventional design.` lThe portion 4 of the tappet whichengages the-cam shaft -*5 is provided with 4a .protective coveringlor ecoating 6 of relatively soft metal such as tin,

babbitt, copper, or lead. In practice I have found it-desirable to applyfirst a coat-ing of tin and then a coating of Babbitt alloy. However,my'invention isnot limitedm its scope to use with this particular partno r to the use of these specific metals or combinations of metals.

.with a-cam. said-bearing face having a metal- The gist of the inventionis broadly the provision of acoating of a relatively soft metal whichupon being sub-" jected to continuedimpa'ct an'dvhard rubbing actionwill be worked into the face of the harder' metal lof which the part iscomposed, forming a smooth polishedsurface which will successfullyresist wear and prevent scoring or cutting ofthe engaging parts `lVhat Iclaim and desire to secure by Letters Patent is:

. l: An impactrec'eiving member having a portion thereof whichissubjectedto impact 5" covered with a thin'coating of'a relativelysoftI metal.

2. An impact receiving member having a portion thereof which issubjected to impact thinly coated Wit-h tin and Babbitt alloy.

3. A valveftappet having the cam shaft engaging portion thinly coatedwith a relatively soft metal. f A valve tappet lhaving the c -am shaftengaging portion thinly coatedwit-h asoft 6" 5; A valve tappet havingthe cam shaft engaging portion th-inlycoated with a soft metallicsubstance containnghabbitt.

6. A'valve tappet having the cam shaft engagimg;` portion thinly coatedwith'tin and a Babbitt-alloy.

7. A tappet having a head formed witha ground bearing face adapted forengagement ...l l l lic, anti-friction surface protecting materialthereon and united therewith.

In testimony whereof I affix my signatl'u'c.

' HARRY FRASER.

